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@exedanni
A cross section of the shackle area would be calculated with the formula:
A = r^2 * pi
So
(13/2)^2 * pi = 132.67mm^2
(18/2)^2 * pi = 254.34mm^2
So you are cutting through twice as much material and not just 38% more which you might immediately think when comparing the numbers 13 and 18.
Also the high end Kryptonite locks tend to be made with stronger steel than cheaper products on the market.
@GA2G - thanks for getting back to me on the SoldSecure question. It's a shame that there isn't a unified European ratings agency, the Fahg Mini is certified by the French Classe SRA and Evo Mini by the German VdS (as printed on either lock), it must be a nightmare for Kryptonite (an American company) to be chasing all the different European ratings agencies for certification...